[DOCS] Adds 8.10.4 release notes (elastic#168599)

## Summary

Adds release notes for 8.10.4

(cherry picked from commit f11b6f9)

docs/CHANGELOG.asciidoc

@@ -10,6 +10,7 @@
 
 Review important information about the {kib} 8.x releases.
 
+* <<release-notes-8.10.4>>
 * <<release-notes-8.10.3>>
 * <<release-notes-8.10.2>>
 * <<release-notes-8.10.1>>
@@ -51,6 +52,19 @@ Review important information about the {kib} 8.x releases.
 * <<release-notes-8.0.0-alpha1>>
 
 --
+[[release-notes-8.10.4]]
+== {kib} 8.10.4
+
+The 8.10.4 release includes the following bug fixes.
+
+[float]
+[[fixes-v8.10.4]]
+=== Bug Fixes
+Elastic Security::
+For the Elastic Security 8.10.4 release information, refer to {security-guide}/release-notes.html[_Elastic Security Solution Release Notes_].
+Fleet::
+* Fixes validation errors in KQL queries ({kibana-pull}168329[#168329]).
+
 [[release-notes-8.10.3]]
 == {kib} 8.10.3